Francis ably follows in the footsteps of his father, Dick Francis, with his second stand-alone set in the English horse racing world (after 2011’s Dick Francis’s Gamble). Mark Shillingford, a TV commentator who covers horse races, is ridden with guilt over an argument he had with his jockey twin sister, Clare, after discovering that she was losing some races deliberately. In the aftermath of the confrontation, an angry Mark lets Clare’s phone messages go to voicemail, a choice he regrets after Clare apparently leaps to her death from a London hotel window. Mark resolves to discover what really happened in the hotel room before the fatal plunge. Suspecting that his sister’s cheating was more extensive than she admitted, he studies old video images of her recent races to spot a pattern that may identify those who wanted her dead to cover up the fraud. Fans will have a hard time distinguishing this solid thriller from the father’s work. Agent: Philippa Brophy, Sterling Lord Literistic. (Oct.)